fix(css-like) Now always detect block comments

[joshgoebel]

• (enh) CSS consistency for function dispatch
• enh(css-like) detect block comments better

Attemps to resolve #3299.

Changes

• Detect block comment even in the value portion
• Add function dispatch highlighting to all CSS-like grammars.

Checklist

• Added markup tests, or they don't apply here because...
• Updated the changelog at CHANGES.md

[allejo]

This PR doesn't directly touch keywords in keyframes but from/to aren't highlighted in Scss + Stylus; though this could probably be another issue. Otherwise, LGTM 👍

[joshgoebel]

This PR doesn't directly touch keywords in keyframes but from/to aren't highlighted in Scss + Stylus;

Yeah, I was just trying to make some progress here, not fix everything. :) Problem for another day. :) Thanks for such detailed review.

[joshgoebel]

I'm not 100% persuaded from and to should be highlighted either, since they are contextual. :)